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arXiv 2008.05499cond-mat.supr-concond-mat.mes-hallcond-mat.mtrl-sci
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1651磁空间群中拓扑超导体的$\mathbb{Z}_2$ -富集对称性指标

$\mathbb{Z}_2$-enriched symmetry indicators for topological superconductors in the 1651 magnetic space groups

Seishiro Ono, Hoi Chun Po, Ken Shiozaki

摘要:

虽然拓扑绝缘体和半金属的基于拓扑的诊断已经使得能够大规模地发现拓扑材料候选物,但是将这些方法扩展到拓扑超导体的诊断仍然是一个主要的未决问题。拓扑超导性分析中的一个重要的新成分是与某些高对称动量相关的$\mathbb Z_2$值Pfiran不变量的存在。这种拓扑不变量超出了能带结构的对称表示理论的常规范围,因此,它们对于纳入能带拓扑的对称性指标的系统计算中是重要的。在这里,我们克服了这一挑战,并报告充分计算的$\mathbb Z_2$丰富的对称指标的超导体在所有的对称设置。我们的研究结果表明,将$\mathbb Z_2$带标签增强诊断能力的计划,在大约$60\%$的对称设置。我们的框架也可以很容易地与第一性原理计算集成,以阐明在给定的化合物中的非常规超导性的可能性质。作为示范,我们明确地分析了最近发现的超导体CaPtAs和CaSb $_2$中的对对称性和拓扑超导电性之间的相互作用。

英文摘要:

While the symmetry-based diagnosis of topological insulators and semimetals has enabled large-scale discovery of topological materials candidates, the extension of these approaches to the diagnosis of topological superconductors remains a major open question. One important new ingredient in the analysis of topological superconductivity is the presence of $\mathbb Z_2$-valued Pfaffian invariants associated with certain high-symmetry momenta. Such topological invariants lie beyond the conventional scope of symmetry representation theory for band structures, and as such they are nontrivial to incorporate into the systematic calculations of the symmetry indicators of band topology. Here, we overcome this challenge and report the full computation of the $\mathbb Z_2$-enriched symmetry indicators for superconductors in all symmetry settings. Our results indicate that incorporating the $\mathbb Z_2$ band labels enhance the diagnostic power of the scheme in roughly $60\%$ of the symmetry settings. Our framework can also be readily integrated with first-principles calculations to elucidate on the possible properties of unconventional superconductivity in a given compound. As a demonstration, we analyze explicitly the interplay between pairing symmetry and topological superconductivity in the recently discovered superconductors CaPtAs and CaSb$_2$.

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